Twin hook.



R. DE LAN. TWIN HOOK.

APPLICATION FILED AUG-Z7. 191s.

Patented Aug. 17, 1915.

Twill zuhomdtmtdg concermu iBei-itiknown' thatl, RICHIE DELAN, of

Philadelphia, inl theicounty of Philadelphia the davits of a ship,

aII-dTState of Pennsylvania, have invented certain new and useful Improvements in Twin Hooks, whereof the following is a specification, reference fleeing had to the accompanying drawings.

My invention relatesi to twin hooks of such constnucti-on that they automatically attach :and detach themselves from the eye "or ring with which' theyare associated, no

other force being exerted on them than the pressure due to their own weight. Such twin hooks are-particularly adapted for use 7 *of'the boat, the hooks .automatically' attach or detach themselves-to or from the eyes with which "the boa t is provided.

In the accompanying drawings, Figure I, is a front view partly in "section, of the fall block'and hooks embodying my inven- 'tion," and an eye which be used to -coshows'a 'to the hooks-engaging the eye. 7

preferred form of eye which may act with the twin hooks. Fig. This a similar -view of the twin hooks and eye ustprior Fig; III,

\ be used to co-act with the twin hooks. Fig.

IV, is a horizontal section along the line IV, IV,'of Fig. "Fig. V, is a partial and much enlarged section showing the locking device. Fig. VI, is -a detail view of the locking pin. v

"The twin hooks consist of the two hooks l, and 2, similarly formed, but oppositely disposed upon the axial bolt 3, upon which they-swing true and free. The hooks are 'formed with "their opposing surfaces flattened to "permit their close approach to each other, and a spacing washer 4:, is set between them upon the bolt 3, to maintainthefhooks in proper-relation. Each hook consists of 8, and a" wing or projection 9, running down below the bight. This. wing is angular-1y disposed in relation to 'the }hook, and is shaped soas to provide along its lower edge a cam or guidingsurface 10." Its angular tween the hooks iii-their and the distance of the center. 3, from the point at which cam surfaces 11, cross one :another.

the ring5jthe sank --6,1the 'bight 7, the point I are.

lnIonInnn LAN, 0F PHILADELPHIA, PENNSYLVANIA.

TWIN HOOK.

Patented Aug. 1?, 1915.

Applica-tion filed August 27, 19 13. Serial :N o. 786;837.

relation to the rest of the hook is best understood "from the drawing. The disposition ofthe weight ofthe yhooks is such that as the hooks hang normally on their pivot, .the canrsurfaces 1 0, of the twin hooks are crossedwith provision of a. reentrant angle between their lower endsto permit the eye to enter between them and force them farther apart. The inner edge of the shank oflthehook is also'formed to provide a sec ondcain orguidingsurface 11. It is by the action of thecam surfaces 10, and ll, which are substantially parallel, that the hooks are successively: attached and-detached from the In Figs. LII, and III, Ihave shown an eye or ring 20, of appropriate shape for cooperation with the twin hooks. It hasa flattened upper portion 21, with curved up- .per corners 22, preferably-straightside portions 23., bent in at the lower ends to form shoulders 31, and pivoted *by the bolt25, to

the eye bolt 26, secured to the object which is to be raised, as tor examplaaboatw It is gimportant-that the distance between the top *bar 21, and the shoulder 31, or whatever forms the lower part of the eye, should be such. that when the hook is lOWQIGCL'lZO enable the bar 21, to operate the releasing cam surfaces, the-lower extremities will not come into contact with the :shoulder [31, or be in any way interfered with by the lower portion of the eye. That is, the distance from the bottom of the hooks to the shoulder 31, must be greater than the distance from the top of the bar 21, to the point to which the hook must be lowered, to cause suflicient expansion of the jaws to enable the hookto be disengaged. The exact position of this point, however, will vary with the size and shape of the hook and of the eye which are-used, depending on the diameter of the bar 21, the acuteness otthe angle benormal position,

For convenience the lower ends of the 28, providinginwconjunction with the flat surface 29,:to which the eye bolt is attached I knuckle-joint, sothatthe eye can only fall through the ends of the eye,

locking the eye in an upright position straddles the top of separate the hooks'as they descend, III),

' slidoff from the eye 1,

flat in one direction. There may also be to hold the eye upright,

provided a catch a cotter pin 30, passing as for. instance,

contact with the side'of the eye bolt. Supposing the eye to be in upright position, and the twin hooks to be lowered, they are guided so that the reentrant angle,

formed by position with1n the hook, as the weight is hoisted. I

If itis desired to release the hooks they are lowered until the topof the-eye comes 'n contact with the inclined inner surfaces "11, 11, of" the shanks of the hooks, These cam surfaces operate to separate the hooks until the points of the hooks are clear of the eye. When thisoccurs, the twin hooks are and thuseffectually released. a The entire operation, both engaging and Y releasing, is therefore performed by merely changing the position of the hooks in relathe twin hooks they are locked and cannot become detached save by manual intervention.

: end and a milled head of one of the tion to the eye. And no actual manipulation of the hooks upon their'pivot is necessary. This enables the device to be operated on the end of a block and tackle, orat someother point at which itis impossible to touch it, and'renders it especially adapted to the case of boats slung from the davits of aship.

AS shown the bolt 3, is supported by a :yoke' 40, which is swiveled by a pin 41, to a yoke 4;.2, the sides of which are embedded in the fall block 43,'and themselves journal the pulley pin thereof.- For greater security an automatic locking device may be provided so that as soon as have closed upon the eye,

Such a looking device may consist of the pin'50, provided with a ball 5li socketedat its lower 52. This pin is carried in a sleeve 53, mounted within the shank twin hooks, so thatthe end of the pin is in proximity to a recess 55,.inthc shank of the other hook. The pin 50,;is encircled by a coiled spring'56, which is confined between the top of the sleeve and a shoulder on the pin, thereby tending to thrust the pin forward. The pin-is also provided with an angular slot 57, which receives a' small point 59, attached to the socket, so'that by rotating the pin '50, when withdrawn against the pressure; of the as shown, and

eye and assumed, the position II, the end ofv the whereupon the by a sidewise motion, v

therein,

and freely suspended therefrom,

itsencircling spring to thrust it forward, as l y soon asthetwin hooks haye closed up on the shown in Fig. pin. 50, is recess 55, in the opposite-hook locking the manually withdrawn. 7 A small roundedprojection 60, maybe placed immediately adjacent to the recess 55,1sothat'just before'the thrust into the 7 two intheir closed position until the pin is 7 hooks assume the locked positiomthe pingls momentarily thrust back. against itsi 'spring,

so thatit may have a- 'greater impetus when shotforward into the recess '55.! A stop pin.

58, may be provided to'limit the motionof 1' the hooks astheyclose together." 1

Having thus .describ a my nvention, 1,

claim:

1. The ,combination of a support, a pivot therein, and oppositely disposedtwin hooks both independently and Ifreelyfsuspended thereon, each'hook having a wing projecting down below the bightgof ,the hook, said wings being provided with opposing cam surfaces' 'in angularrelation to each other 3 when the hooks hang normally on-the pivot.

2. The combinat on .ofa support, a p vot and oppositely disposed twinhooks both independently and freely suspended thereon, each provided with surfaces on the inner-edges of thejshanks of hooks: jfiye' co-acting with, said" V hooks, said cam surfaces being disposed in angular relationwhen the hooks hang norapart by the eye,

opposed cam" '6 ,mally on thepivot and. free to be thrust with automatic disengagement' of ,the eye from the hooks by; thedescent of the-hooks in relation to the eye. 3

3. A support, twin hooks independently the inner edges thereof, and. other cam surfaces substantially parallel, thereto on the each of inner sides of the shanks of'the "hooks and 'in angular, relation to each other.

4:. 1 The combination of a support, a pivot therein,and oppositely disposed twin hooks in eachhook with cam surfaces on the. inner edges thereof; and other cam surfaces on the inner. edgesof the .shanksof said hooks substantially parallel to the lower eam'surfaces,

both independently and V freely suspended thereon, wings projecting below the bight.

said vsurfaces"being in angular relation to j a each other when the hooks hanginormally on 'thejpivot. M v 5. The combination of a support, a pivot therein, and twin hooks, oppositely disposed, both independently and thereon; wings projecting below the bight -in each hook with cam surfaces on the, inner edges thereof, and other cam surfalces the freelyflsuspended. i

inner edges of the shanks of said hooks subsigned my name at Philadelphia, Pennsylstantially parallel to the lower cam surfaces, Vania, this twenty-third day of August, 1913. said surfaces being in angular relation when the hooks hang normally on the pivot; and RICHIE DE 5 an interacting means for locking the hooks Witnesses:

in the closed position. JAMES H. BELL,

In testimony whereof, I have hereunto E. L. FULLERTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

7 Washington, I). C. 

